It's not gutless, I just can't use 5th gear on the highway if there is wind coming at any angle other than from behind me. 3:73's on 31" tires. I've been in situations before (45mph-60mph headwind) where I was in third gear with the pedal to the floor and I could barely keep it going 55mph. Your PM box is full so I just pasted my reply here.

3.73's that's nothing I have 3.07 in my rear with 33" tires. With my 4.0 it didn't matter what way the wind was blowing you couldn't use 5th gear.

That's odd. I have a Factory fuel injected 92 with a 4.0L Renix Head (not even the H.O. head) 5sp an 3.73's with 32's an I climb hills in 5th with no problem doing 60mph. Down shift to 4th an I am passing people.

I would have to say there is something definitely wrong with what you have going. Or I got very lucky. This is the second renix motor I have ran. Both have been strong runners which is why I have not felt the need to get a H.O. head yet as long as I keep the rest of the H.O. injection system.

I was in the same situation with my new-to-me YJ 4.0L two yesterday when trying to pass on two lane highways.

Keep in mind that 4.0's probably have a lot of miles on them by now. Mine has 182k miles, so it probably doesn't have the power it once did. Add to that the different configurations of YJ's that are even less aerodynamic than stock ones... and faster highway speeds in some states. On the 60 MPH two-lane I was on, I'd have to get my 3.73 (I believe) YJ with new 31" tires up over 80 to make a pass. If that happened it would take a tail wind, and I almost got myself killed trying it when the tailwind died.

I was in the same situation with my new-to-me YJ 4.0L two yesterday when trying to pass on two lane highways. Keep in mind that 4.0's probably have a lot of miles on them by now. Mine has 182k miles, so it probably doesn't have the power it once did. Add to that the different configurations of YJ's that are even less aerodynamic than stock ones... and faster highway speeds in some states. On the 60 MPH two-lane I was on, I'd have to get my 3.73 (I believe) YJ with new 31" tires up over 80 to make a pass. If that happened it would take a tail wind, and I almost got myself killed trying it when the tailwind died. I won't be trying to pass people in the future.

My 4.2 isn't bad at all when trying to pass people.. Just make sure you have runway.. Oh and I have 33x12.5x15
And 3.07 gearing... Talk about a dog

my 4.0 with 3.07 and auto trans never had any trouble passing. What I do is hang back a ways and time the opening, and floor it well before the oncoming car is out of the way. then you will have a nice run. mine also has under 100k miles on it too

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-April '14- YJoTM- June '15

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It's not gutless, I just can't use 5th gear on the highway if there is wind coming at any angle other than from behind me. 3:73's on 31" tires. I've been in situations before (45mph-60mph headwind) where I was in third gear with the pedal to the floor and I could barely keep it going 55mph.

I was in the same situation with my new-to-me YJ 4.0L two yesterday when trying to pass on two lane highways.

Keep in mind that 4.0's probably have a lot of miles on them by now. Mine has 182k miles, so it probably doesn't have the power it once did. Add to that the different configurations of YJ's that are even less aerodynamic than stock ones... and faster highway speeds in some states. On the 60 MPH two-lane I was on, I'd have to get my 3.73 (I believe) YJ with new 31" tires up over 80 to make a pass. If that happened it would take a tail wind, and I almost got myself killed trying it when the tailwind died.

I won't be trying to pass people in the future.

I was able to do 70-90 and stay in the left lane on busy freeways when the Jeep was new to me. Back then it had just under 100k miles and bald BFG AT's. Now it's got about 182k (like yours) and doesn't have as much power as it once had. I used to pass people all the time, but I don't bother now.

I actually used to race up this one hill that I had to drive up every day after work. All the old people take it at 35mph (steep hill). I'd wait until the top, so I could see if it was safe, and then blow by them. Can't do THAT anymore.

Of course, I do carry about 250lbs of bumpers, winch, hi-lift and spare tire now that I didn't have back then. That probably adds to the problem.

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